Update docs/product/monitors-and-alerts/alerts/index.mdx

Co-authored-by: Alex Krawiec <alex.krawiec@sentry.io>

Author: sfanahata

docs/product/monitors-and-alerts/alerts/index.mdx

@@ -8,7 +8,7 @@ og_image: /og-images/product-alerts.png
 
 <Include name="feature-available-for-user-group-early-adopter" />
 
-Sentry's **Alerts** take action when issues in your organization match the defined rules. An alert can send notifications, create tickets, call webhooks, or use other [integrations](/organization/integrations/)—for issues coming from projects or [Monitors](/product/monitors-and-alerts/monitors/).
+Sentry's **Alerts** take action when issues in your organization match pre-defined rules. An alert can send notifications, create tickets, call webhooks, or use other [integrations](/organization/integrations/)—for issues coming from projects or [Monitors](/product/monitors-and-alerts/monitors/).
 
 ### Some examples of when you could use an Alert